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[RESTRICT AUTOMERGE] Fix CryptoPlugin use after free vulnerability. am: a4e76aab23

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Original change: https://googleplex-android-review.googlesource.com/c/platform/hardware/interfaces/+/13812193

Change-Id: I59565fec934a5be32b5c5f32b6586965a7d9a932
This commit is contained in:
Edwin Wong
2021-04-06 21:49:14 +00:00
committed by Automerger Merge Worker
parent 2179627078 a4e76aab23
commit 6effd16a8b
3 changed files with 22 additions and 10 deletions
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3
drm/1.0/default/Android.bp
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@@ -9,6 +9,7 @@ cc_library_static {
"-Werror",
"-Wextra",
"-Wall",
"-Wthread-safety",
],
shared_libs: [
"liblog",
@@ -19,5 +20,5 @@ cc_library_static {
export_header_lib_headers: [
"libutils_headers",
],
export_include_dirs : ["include"]
export_include_dirs: ["include"],
}

8
drm/1.0/default/CryptoPlugin.cpp
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@@ -53,6 +53,8 @@ namespace implementation {
uint32_t bufferId) {
sp<IMemory> hidlMemory = mapMemory(base);
std::lock_guard<std::mutex> shared_buffer_lock(mSharedBufferLock);
// allow mapMemory to return nullptr
mSharedBufferMap[bufferId] = hidlMemory;
return Void();
@@ -65,7 +67,7 @@ namespace implementation {
const SharedBuffer& source, uint64_t offset,
const DestinationBuffer& destination,
decrypt_cb _hidl_cb) {
std::unique_lock<std::mutex> shared_buffer_lock(mSharedBufferLock);
if (mSharedBufferMap.find(source.bufferId) == mSharedBufferMap.end()) {
_hidl_cb(Status::ERROR_DRM_CANNOT_HANDLE, 0, "source decrypt buffer base not set");
return Void();
@@ -173,6 +175,10 @@ namespace implementation {
_hidl_cb(Status::BAD_VALUE, 0, "invalid destination type");
return Void();
}
// release mSharedBufferLock
shared_buffer_lock.unlock();
ssize_t result = mLegacyPlugin->decrypt(secure, keyId.data(), iv.data(),
legacyMode, legacyPattern, srcPtr, legacySubSamples.get(),
subSamples.size(), destPtr, &detailMessage);

21
drm/1.0/default/CryptoPlugin.h
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@@ -17,11 +17,14 @@
#ifndef ANDROID_HARDWARE_DRM_V1_0__CRYPTOPLUGIN_H
#define ANDROID_HARDWARE_DRM_V1_0__CRYPTOPLUGIN_H
#include <android/hidl/memory/1.0/IMemory.h>
#include <android-base/thread_annotations.h>
#include <android/hardware/drm/1.0/ICryptoPlugin.h>
#include <android/hidl/memory/1.0/IMemory.h>
#include <hidl/Status.h>
#include <media/hardware/CryptoAPI.h>
#include <mutex>
namespace android {
namespace hardware {
namespace drm {
@@ -60,19 +63,21 @@ struct CryptoPlugin : public ICryptoPlugin {
Return<void> setSharedBufferBase(const ::android::hardware::hidl_memory& base,
uint32_t bufferId) override;
Return<void> decrypt(bool secure, const hidl_array<uint8_t, 16>& keyId,
const hidl_array<uint8_t, 16>& iv, Mode mode, const Pattern& pattern,
const hidl_vec<SubSample>& subSamples, const SharedBuffer& source,
uint64_t offset, const DestinationBuffer& destination,
decrypt_cb _hidl_cb) override;
Return<void> decrypt(
bool secure, const hidl_array<uint8_t, 16>& keyId, const hidl_array<uint8_t, 16>& iv,
Mode mode, const Pattern& pattern, const hidl_vec<SubSample>& subSamples,
const SharedBuffer& source, uint64_t offset, const DestinationBuffer& destination,
decrypt_cb _hidl_cb) override NO_THREAD_SAFETY_ANALYSIS; // use unique_lock
private:
private:
android::CryptoPlugin *mLegacyPlugin;
std::map<uint32_t, sp<IMemory> > mSharedBufferMap;
std::map<uint32_t, sp<IMemory>> mSharedBufferMap GUARDED_BY(mSharedBufferLock);
CryptoPlugin() = delete;
CryptoPlugin(const CryptoPlugin &) = delete;
void operator=(const CryptoPlugin &) = delete;
std::mutex mSharedBufferLock;
};
} // namespace implementation